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Related Experiment Videos

CD70 expression in thymic carcinoma.

T Hishima1, M Fukayama, Y Hayashi

  • 1Department of Pathology, Tokyo Metropolitan Komagome Hospital, Japan.

The American Journal of Surgical Pathology
|May 9, 2000
PubMed
Summary
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CD70 expression is linked to thymic carcinoma development, not Epstein-Barr virus infection. This study found CD70 in thymic carcinomas and atypical thymomas, but not other thymic tumors or non-thymic cancers.

Area of Science:

  • Oncology
  • Immunology
  • Pathology

Background:

  • CD70 (tumor necrosis factor family member) mediates lymphocyte interactions.
  • CD70 is expressed in lymphomas and nasopharyngeal carcinoma, often linked to Epstein-Barr virus (EBV).

Purpose of the Study:

  • Investigate CD70 expression in thymic epithelial tumors.
  • Determine the association between CD70 and EBV in these tumors.

Main Methods:

  • Immunohistochemistry on frozen tissue samples of thymic epithelial tumors.
  • Northern blot analysis for CD70 messenger RNA.
  • In situ hybridization for EBV-encoded small RNA.

Main Results:

  • CD70 was expressed in 88% of thymic carcinomas and 20% of atypical thymomas.

Related Experiment Videos

  • No CD70 expression was detected in thymomas, thymic carcinoids, or non-thymic intrathoracic tumors.
  • CD70 messenger RNA was found in thymic carcinomas but not other thymic tumor types.
  • All thymic epithelial tumors were EBV-negative.

    • Conclusions:

    • CD70 expression is significantly associated with thymic carcinoma pathogenesis.
    • CD70 expression in thymic epithelial tumors is independent of EBV infection.